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Voters in the crucial swing state will also decide key questions on their — and our — climate future.

In four days, Pennsylvania will become just about the most important place on Earth.
It is unlikely that either Kamala Harris or Donald Trump can reach the White House without carrying the Keystone State; winning Pennsylvania bumps either’s odds of prevailing in the whole election to over 90%, according to polling analyst Nate Silver’s models. The state will also play a deciding role in control of the U.S. House and Senate, which in turn will help or hamper the next president’s agenda. America’s domestic trajectory, its foreign policy decisions, and even its allies and enemies could all come down to the whims of the state’s 8.9 million registered voters.
But Pennsylvanians have other important choices to make on their ballots, too. “Pennsylvania is a major energy state, and its decisions — regardless of what type of energy it is — have a huge impact on America’s energy portfolio,” John Qua, the campaign manager of Lead Locally, which is supporting 17 down-ballot candidates in the state, told me.
As the nation’s second-biggest gas producer after Texas and third-biggest coal producer after Wyoming and West Virginia, Pennsylvania also holds the distinction of being the fifth-largest greenhouse gas-emitting state in the nation. Its state legislature hasn’t passed new climate legislation since 2008, in large part because of the influence of the fossil fuel industry over local politics. The American Petroleum Institute donates more to Pennsylvania lawmakers than those in any other state, and while fracking isn’t the decisive local issue it’s made out to be in the popular consciousness, it still employs around 100,000 people — more than made the difference in deciding the 2020 election in the state. (Harris notably reneged on her 2019 pledge to ban fracking if elected in an apparent overture to Pennsylvanians, although the state’s imperiled Democratic senator, Bob Casey, has been hammered by his Republican challenger over her prior position.)
Pennsylvania has a Democratic governor, Josh Shapiro, until at least 2026, and Democrats hold slim control over the state House of Representatives by a margin of 102 to 101. The ambition this cycle is to keep the state House and flip the Republican-held state Senate. Picking up three seats there would earn Democrats a governing trifecta, with a tie-breaking vote going to Democratic Lt. Gov Austin Davis. Flip four seats, and they’d have the majority.
But “if you asked me to bet you $10 that the Democrats would win, I wouldn’t take the bet,” David Masur, the executive director of PennEnvironment, a green research and advocacy group that works in the state, told me. “I think it’s just a long shot.”
The path to winning the state Senate and achieving a governing trifecta clearly runs through three districts. The first and easiest pickup is in SD-15, around the state capital in Harrisburg, where the “map is much friendlier to Democrats,” according to Masur. The party would then need to win a competitive seat in SD-37, in the Pittsburgh suburbs, which has tilted blue recently and also seems theoretically within reach. But things get trickier in SD-49, Democrats’ “white whale” district in Erie County, which President Biden won by 2 points but where Republican senator Dan Laughlin remains well-liked. To wrest back the chamber, in other words, the Democrats would “have to run the table,” Masur said. “I don’t even think there’s another race where you could go, ‘Oh, they could get the majority by winning this other seat.’ There’s nowhere else to go. They have to win those three.”
Because of recent redistricting, the climate groups working in the state are cautious about getting their hopes up too high. “Flipping the [state] Senate, which is currently held by Republicans, might be a two-cycle endeavor with these new maps,” Lead Locally’s Qua said. This doesn’t necessarily mean all is lost: Even maintaining control of two of the three levers of government in Pennsylvania would be a victory, and Democrats this summer managed to garner enough bipartisan support to pass legislation to bring solar panels to state schools.
But the stakes — and promises — of a trifecta feel crucial and tantalizingly close. According to a recent analysis by PennEnvironment, Pennsylvania is 48th in the nation for the percentage growth of total solar, wind, and geothermal in the past decade, and 46th in the nation for the percentage of growth in total solar over the past five years, generating less than its neighbors New Jersey, Maryland, and Ohio. “The fossil fuel industry is extremely moneyed and extremely influential, and it’s created a political reality where it’s very difficult to move good climate and clean energy policy forward in Harrisburg,” Flora Cardoni, PennEnvironment’s deputy director, told me. Climate obstructionists in the state Senate often refuse to call up good environmental policies for votes, leaving the state with “no laws on the books that require utility companies in Pennsylvania to increase the amount of clean renewable energy that they provide to their customers” which is “a huge impediment to progress.”
It’s not as if Democrats aren’t ready to go — they are. Shapiro is sitting on a two-bill plan for tackling climate change in the state. One would boost renewable energy to 35% of Pennsylvania’s total generation by 2035, which Cardoni described as “a huge step in the right direction, although we need to do much more.” The second bill would make polluters pay for their carbon emissions and spend the resulting money on clean air, water, and energy efficiency projects — essentially, a backup plan for if the state’s attempt to join the Regional Greenhouse Gas Initiative fails. (Owing to a question of constitutionality, RGGI is in limbo with the state’s Supreme Court.)
So, in a sense, you have to go for it. “Yeah, they’re really hard races,” admitted Caroline Spears, the executive director of Climate Cabinet, which is supporting 26 candidates in the state. “But if you win,” she added, “you win the fifth-largest greenhouse gas emitter in the country.” While she was loath to “compare our states against each other,” Spears pointed out that Pennsylvania’s emissions are about two and a half times those of Arizona, which makes it a much bigger opportunity for reductions.
Perhaps the most important point: No one really knows what’s going to happen. Not only are organizers working with new maps in the state due to 2022 redistricting, but state-level races also rarely attract substantial enough polling to make reliably predictive guesses, especially when there are so many toss-ups and razor-thin margins. Adding to the trickiness, Pennsylvania is one of the few states where residents still appear willing to split their tickets; in 2020, ticket-splitting between the president and the state Legislature was up to 15 points in places, which is part of why Climate Cabinet has targeted races in the state with margins of up to 10 points that other groups wouldn’t touch. “Folks have been like, ‘the Pennsylvania Senate’s not doable.’ That’s the word on the street,” Spears told me. “But I think people are forgetting a little bit that that was also the word on the street about the Minnesota Senate and the Michigan legislature,” which flipped during the 2022 midterms.
What’s encouraging is that Pennsylvania voters — contrary to their image of being fracking obsessives — have been curious or even enthusiastic about pivoting to clean energy when organizers have spoken with them. Following Winter Storm Elliott in 2022, which caused outages across the state, many residents now “recognize that the grid is outdated,” Julia Kortrey, the deputy state policy director at Evergreen Action, a national climate advocacy group, told me. There’s an acknowledgment among many that “the status quo is not working.”
As in many parts of the country this year, local races in Pennsylvania are mainly focused on battles over education, abortion access, immigration, and crime, not necessarily clean energy. But often, climate-related issues are bubbling just under the surface. “I’m not going to go up to someone’s door and ask ‘What issue is on your mind today?’ and have them say, ‘I’m really worried about the PM2.5 concentration or the Mauna Loa CO2 readings,’” Spears told me. “But if they’re like, ‘The cost of living is too high,’ I’m going to have a conversation about home insurance.”
A particularly good example of this is playing out in one of Pennsylvania’s U.S. House races, which will help determine the ultimate makeup of Congress. In the Lehigh Valley, Democratic Representative Susan Wild is attempting to hold off her Republican challenger, state Representative Ryan Mackenzie, who voted against the school solar bill and the state’s clean water act. Wild had been particularly instrumental in helping to replace lead pipes in the area, and she’s made her leadership on the issue prominent in her campaigning. “The Bipartisan Infrastructure Law and lead pipe removal can seem very — I don’t want to say national, but it can be hard to visualize,” Nate Fowler, the regional campaigns director of the League of Conservation Voters, told me. “But for voters in this part of the Commonwealth, it’s easy for them to understand why this is so important.”
It won’t be until after the dust from Tuesday settles — when Pennsylvania’s 19 electoral college votes have been allocated, and its U.S. House and Senate races decided — that national attention will turn to the consequences of the state’s down-ballot races, if it ever does. But whether Democrats run the table or Republicans eat into their opponents’ grip on the legislature, Pennsylvania’s elections will be pivotal to the nation’s greater evolving energy story.
“So much of what we can accomplish in Pennsylvania will lay the groundwork for what is accomplished across the country,” Kortrey, of Evergreen Action, said. “I tell folks, ‘If we can do it in Pennsylvania, we can do it anywhere.’”
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The data center boom is everywhere you look in U.S. economic and emissions data.
This is an edition of Heatmap Daily, an evening review of the day’s news written by our executive editor. Sign up for it here.
It isn’t exactly a new thought, but I’ve been struck recently by how many trends in America’s economic and environmental data are fundamentally about the data center boom and the return of electricity demand:
First, the Energy Information Administration reported this week that U.S. emissions grew by more than 2% last year, driven by surging electricity demand and an increase in coal-fired generation. What caused that higher power demand? New factories and data centers — as well as record summertime cooling demand.
Second, many of the new factories driving that higher power demand are themselves producing goods that are … let’s say … data center-adjacent. There are the enormous new semiconductor fabs, of course. But Ford and General Motors have also set up new production lines (or repurposed old ones) to manufacture grid-scale batteries to meet power demand.
Third, take a look at the recent U.S. spending on private non-residential construction — in other words, everything American companies are building that is not houses, condos, or apartments.
The construction industry’s spent almost $60 billion on data centers over the past year, which is more than it spent on all other office buildings combined (and more than it spent building warehouses, too). Just a handful of categories — data centers, power plants, electricity infrastructure, and certain kinds of electronics manufacturing — now make up a third of all U.S. private non-residential construction investment. They’ve never made up such a large share of construction spending since data collection began in 2014.
As The New York Times recently noted, the American economy is unusually dependent on the American stock market right now — and the stock market is unusually dependent on artificial intelligence. This week, investors started to balk at the enormous spending hyperscalers are planning to keep building out the AI boom; Alphabet’s shares dropped 8% this week after it boosted its planned 2026 capital expenditure and signaled 2027 will be even bigger. If the data center boom started to slow down in earnest, then more than just that budget will change.
Speaking of which, my colleague Emily Pontecorvo wrote earlier this week about how many businesses are struggling to even estimate their carbon emissions from artificial intelligence. The carbon accounting startup Watershed recently unveiled a new formula to help companies get a sense of their AI-related emissions.
But even that formula is still limited by the amount of data hyperscalers publish — and they don’t publish that much. Google, for instance, is the only AI company that has (laudably) provided estimates of its emissions on a per-prompt basis. Yet no company has published its per-token emissions, or how emissions sync up with particular models or regions.
So Emily asked Google: Why aren’t you — or any other model provider — disclosing this kind of data yet?
The tech company didn’t get back to us until after we’d published Emily’s story. But its response was interesting enough that I wanted to quote some of it here.
The problem is “industry consensus,” Cooper Elsworth, a Google spokesperson, told us. “There is currently very little consensus on how to comprehensively and fairly measure the serving environmental impact of generative AI (such as text generation),” he wrote. “Without standardized, ‘apples-to-apples’ frameworks, it is difficult to compare different providers accurately.”
That’s partly because energy use — and emissions data — can vary from site to site and depend on “custom-built hardware, software compilers, and advanced inference techniques.” And he claimed Google doesn’t always have the measurement hardware in place to provide such specific estimates: “Providing precise, repeatable data requires highly advanced measurement infrastructure,” he said. “For example, software-based energy monitoring tools often suffer from sampling biases. For our study, we had to step away from top-down averages and directly measure actual energy at the physical power supply unit (PSU) level across our deployed fleet. Not all providers have the telemetry or data sets required to benchmark their operations at this level of granularity.”
Read Emily’s story to understand the other reasons why estimating — or even “guesstimating” — AI-related carbon emissions is so challenging.
A conversation with Emma Uridge of the Kansas Health Institute.
This week’s conversation is with Emma Uridge, analyst with the Kansas Health Institute. Uridge spent copious hours analyzing state and local laws on data center development to best understand how policymakers are responding to the potential environmental public health impacts of large AI infrastructure, including power and water. The report, which came out this week, also goes in depth into those health impacts. I reached out to her to discuss what she sees as must-watch territory for our readers on this emerging policy arena.
Our conversation was lightly edited for clarity.
What is actually being done on policy when it comes to data centers — beyond moratoria of course?
So first I’d like to just talk about the point of moratoria. It’s helpful to talk about how these policies emerge in the first place. One area where moratoria are helpful is when a data center is proposed but the county has no approach for how they’d like to potentially regulate them. That’s temporary, most of the time. It lets local governments conduct research on the various impacts and also negotiate community benefits, ones that can mitigate any potential negative impacts — like Lancaster Pennsylvania, which instituted a community benefit agreement that maximized the potential benefits of development while mitigating what large data centers can do. That agreement looked at capping municipal water use at 20,000 gallons per day and requiring 100% clean energy. It had financial penalties for non-compliance. The company also committed $20 million to their local economic development and clean energy fund. There are ways to negotiate with developers.
We also see amendments to existing zoning. Data center proposals are increasingly popping up in rural areas, many of which are unzoned, so there’s no way a county can negotiate unless there’s a moratorium in place.
Other policy solutions include different performance standards or requiring on-site renewable energy, like what Jefferson County, Missouri, looked at. Also setback requirements, mandatory noise buffers, ending by-right zoning.
Where are local governments getting ideas for regulating data centers?
A lot of the technical information comes from developers. That can in cases be seen as a biased source of information. I wouldn’t say there’s a dedicated group providing assistance to local governments when a project is proposed — which is a similar story to wind industry development, where we have only a handful of consultants who provide technical advice. It can be really helpful to get a multi-disciplinary approach to hearing information. It can be helpful to have the utility commission, public health folks, those in academia, as well as the developer.
As of right now, especially in rural areas, local governments have a hard task of balancing pushback while getting the most accurate, evidence-based, neutral information to make decisions. That balance can be contentious.
What is the federal government doing on data center policy? How is the Trump administration approaching it?
A few things there. In the early days, the drive was for AI expansion and to be competitive with foreign adversaries. Now due to the amount of public pushback in red and blue localities and a more cautious approach.
I’m not seeing a lot of actual policy movement at this time.
I know the EPA is looking at the chemicals used in cooling data centers because when that water is cycled through the system, some of it is discharged into the water system, so they’re looking at the Toxic Substances and Control Act for monitoring that.
How much of an impact does this minimal federal role have on industry behavior?
Y’know, this isn’t specific to data centers. This is true for all kinds of large-scale development: there’s a need to require some sort of federal monitoring and regulation.
That’s where I see an emerging role for public health. At the federal level, there could be policy movement towards requiring some sort of environmental monitoring at data centers to make sure they’re operating responsibility. Looking at specific water use relative to water availability and what happens when there’s a time of severe, persistent drought. With air quality too — we’ve seen areas where the grid isn’t as reliable so their diesel generators are kicking on more and affecting air quality for residents.
We’re just not seeing all of that right now. We need corporate disclosure.
What do you see as the most important public health impacts from data center development?
It varies by localities. The most discussed obviously is water usage. One thing I’d note about my conversations with folks enthusiastic around emerging tech is, there are still questions that need to be asked about the capacity of localities to support a data center. Like a small town in Kansas may only be using 40% of their water for their utility needs. If a data center came online, how much of that water goes to the data center?
One area underexplored within the public health discipline is energy poverty and energy security. The ability of a household to meet the needs of everything energy provides in our lives. It’s known we have an aging electric grid but we’re not talking enough about large-scale blackouts when the grid is not sufficient to support some of these new data centers.
Plus more of the week’s big development fights.
1. Laramie County, Wyoming — Meta is fighting the fine it received in the Cheyenne data center water pollution controversy, and the conflict between the tech giant and the city’s small board of public utilities is continuing to spill out into the public.
2. Niagara County, New York — This county just rejected a solar project’s highway work permits in a show of retaliation against the state’s Office of Renewable Energy Siting.
3. Barron County, Wisconsin — The anti-solar protest is the new campaign stop in deep red Wisconsin.
4. Chesapeake, Virginia — A large battery storage project on the Virginia coastline is on the rocks amidst rampant local opposition.
5. Lewis County, West Virginia — West Virginia is now a key battleground in the fight over transmission, as a line spanning all of West Virginia and Maryland — and cutting through Data Center Alley in Virginia — causes compounding consternation.